Document subcoordinate_group_ranges by extending the EEG Viewer demo

[maximlt]

This makes the example a bit more complicated as it adds another data dimension but I think overall it is still fine, and from what I understand having multiple groups when dealing with EEG data is not unexpected.

[droumis]

Refactored, adding different data type groups, plotting from wide pandas DFs, coloring, rasterization of the minimap, and other minor edits.

[droumis]

@maximlt please check my changes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.47%. Comparing base (2ba3d78) to head (3e8629d).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6243      +/-   ##
==========================================
+ Coverage   88.39%   88.47%   +0.08%     
==========================================
  Files         323      323              
  Lines       67620    67639      +19     
==========================================
+ Hits        59770    59846      +76     
+ Misses       7850     7793      -57     

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[maximlt]

@droumis very nice updates thanks! I simply added a redirect link in 3e8629d since the EEG Viewer Bokeh demo was already released (I'm running a doc build on the CI now to check if it builds correctly). I'll merge when everything passes.

[github-actions]

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